Packing-extracting bit.



H. H. BALES.

PACKING EXTRACTING BIT, APPLIOATION FILED NOV. 13, 19052.

Patented Aug. 24, 1909.

ANDREW. B. GRAHAM 00" PHOTO LmIOOMPHERS, WASNMQYON nnrrnn sra rns ra'rnn FFEQE.

PAGKING-EXTRACTING BIT.

To all whom it may concern:

Be it known that 1, Hanan HERBERT BALES, a subject of the King of Great Britain, and resident of the town of Ashcroft, in the district of Yale-Uariboo, in the Province of British Columbia, in the Dominion of Canada, have invented certain new and useful Improvements in Packing-Extracting Bits, of which the following is a specification.

The invention relates to improvements in packing extracting bits, as described in the following specification and illustrated in the accompanying drawings that form part of the same.

The invention consists essentially in the novel construction and arrangement of parts whereby the packing is gripped by a bit having a helical central member and a member twined around said central member.

The objects of the invention are to devise a bit for extracting packing from the stufiing boxes of engines or other like devices, which will loosen the packing and grip it securely, so that it may be easily withdrawn, and to provide an article of simple, cheap and durable construction. .1

In the drawings, Figure 1 is a view of my device shown partly in section. Fig. 2 is a cross sectional view through the line AB Fig. 1. Fig. 3 is an end view of the device.

Referring to the drawings, 1 is the central member of the bit formed of a spiral of the cork screw type having a very slight incline to its )lane. The metal forming the spiral 1 is oval shaped in cross section, the upper and lower sides converging to a narrow cutting edge 2, which cuts its way into the packing as the spiral is turned, the end of said spiral being sharpened to a line point.

3 is the shank of the spiral 1 having a threaded end 4.

5 is an auxiliary spiral preferably formed of round spring steel wire and twined around the spiral 1, hugging the said spiral closely at its upper end and gradually increasing in diameter toward its lower and outer end, the circle of said outer end being of larger diameter than the outer diameter of the spiral 1 so that the sharpened end 6 of said auxiliary spiral extends beyond the cutting edge 2. The auxiliary spiral 5 is rigidly secured to the spiral 1 at its upper end by being soldered or brazed at its upper end. The referable form and arrangement of the spira s 1 and '5 is shown.

7 is a handle having a socket 8 formed at Specification of Letters Patent.

Application filed. November 13, 1908.

Serial No. 462,481.

the end of the shank 9, the said socket being threaded to correspond with the threaded end at of the shank 3 of the spiral 1.

10 is a set screw threaded in the side wall of the socket 8 and engaging the threaded. portion a of the shank 3.

In the use of this device, the point of the spiral 1 is inserted in the packing and turned to force the cutting edges 2 into the wall thereof, the substantially flat and perpendicular sides of the spiral 1 resenting a large resisting area to the packing. As the spiral is turned farther, the sharp point 6 of the spiral 5 enters the packing close to the outer side thereof, and the converging formation of the said spiral 5 draws the packing inwardly, thus forcing the packing inwardly into the spiral groove formed by the spiral 1. The use of the spiral 5 accomplishes a two fold object, it loosens the packing from the walls of the orifice in which it is located and simultaneously draws it inwardly to insure the flat surface of the central spiral obtaining a very secure grip thereon. When the device has been screwed into the packing a sufficient distance to loosen it thoroughly and to obtain a suflicient grip, the instrument is withdrawn by a straight pull, drawing the packing with it and cleaning out the orifice in which the packing was located.

It is important that the central spiral 1 extend beyond the auxiliary spiral so that the sharp point and edge of said central spiral may enter the packing easily. Further, the peculiar formation of the auxiliary spiral is mostimportant as it wedges the packing into the tapering interspace between it and the spiral 1 and a very secure hold is obtained.

The bit is shown with a threaded shank to screw into a handle, but the said shank may be formed in any desirable manner to assist the turning or withdrawal of the bit.

What I claim as my invention is 2- 1. In a packing extracting bit, a spiral formed with an outer cutting edge and a flat surface arranged substantially in perpendicular relation to the axis of the spiral, and an auxiliary spiral encircling the aforesaid spiral and rigidly secured thereto.

2. In a packing extracting bit, a spiral member having a flat surface arranged in substantially right angular arrangement with the axis thereof and tapering to a narrow cutting outer edge, and an auxiliary spiral encircling the aforesaid spiral and rigidly Patented Au 2d, 1909.

secured thereto, said latter spiral flaring outwardly to its outer end.

3. In a packing extracting bit, a spiral member having an outer cutting edge and a flat surface in right angular arrangement With its axis, and an auxiliary spiral encircling the aforesaid spiral and rigidly secured at its inner end and flaring outwardly at its outer end and terminating in a sharp point.

4. A acking. extracting bit, comprising a centra member helically formed and hav- 

